Process and apparatus for use in connection with flongs



Jan. 24, 1928.

C. J. V HENTSCHELL ET AL PROCESS AND APPARATUS FOR USE IN CONNECTION WITH FLONGS Cfiar/as J K 1% 2 Sheets-Sheet 2 Jan. 24, 1928.

C. J. V HENTSCHELL ET AL PROCESS AND APPARATUS FOR USE IN CONNECTION WITH FLONGS Filed Jan. 24, 1927 Patented Jan. 24, 1928.

UNITED STATES onrinnns J. V; nnnrsonnnn Ann enonen H. XVI-IELDON, or MINNEAPOLIS, MINNE- sora, Assienons or ONE-FOURTH TO, Josnrrr E. MURPHY AND ONE-FOURTH T0 WILLIAM HALL, Born or iarnn'naronrs, rainnnsora.

PROCESS AND APPARATUS FCPV USE IN CONNECTION WiI'II-I FLONG-S.

Application filed January 24, 1927. Serial No. 163,134.

Our invention relates tosteieotype castin matrices, and more particularly to an improved apparatus tor use in heatingmolding blankets, and an improved process which includes theheating of such a blanket and its application while hot to the back of a dry :tlong, commonly called a mat, applied to a type form, andin'squeezing said long by pressure applied to the blaiiket to form a matrix. Said process further includes the covering of the molding blanket with one or of the matrix, insulate the primary molding.

blanket from the roller or platen of the Dilfitft'lil molding machine. f i

In producing a matrix trom Which a stereotype plate is to be formed, it is now the general practice to use a, dry flong for making a matrix from a type] form, after the same has been subjectedto moisture, so that it will be morelreadily squeezed into the depressions in. said form and shape itself around the type faces under pressure applied thereto. type form, and on theback-of saidflong is laid a primary molding blanket formed from ground cork and held formed by a suitable binder. On the back of the primary molding blanket is laid one or more secondary wool felt or fibrous molding blankets. Said long and molding blankets are then subjected to pressure and the function of the cork molding blanket is to squeeze the long into the (lEPlQSSlOHSill the type form and aroundthe type faces to form a matrix.

Cork molding blankets, as noivused in connection with dry flongs, are i'iotvery satisfactory, att'terlittle use, as they do not cause the dry flong tOjQl'OClllCB a matrix of the proper depth with a sharp impression and a perfect face with minimum pressure,

which is highly essential in making a perfect matrix, for the reason that said blankets have very little life or elasticity and hence .do, not resume their original form after beingdistorted by the irregular surfaces of This flong is laid on the:

printing plane to a type itorms,and iturther nore they are comparatively brittle and easily broken and cork molding blanket Will not press a dry .fiong to the proper depth into all of; the

depressions in a type form and around the typefaces. As the life of a cork molding blanket, as now used, is comparatively short, the expense of replacing the same is considerable. r 1

1 Our improved process includesthe heating at a cork molding blanket and the use of the same While hot for the purpose OfPUtting life into said blanket Which increases its elasticity so that it Will be more readily distorted and press the long into the depressions in a type form and around the hence it is evident that a rough aiidbroken type faces, and ivhile thus distorted: by

pressure during the formation of a matrix, will resume its original shape when the pressure is removed, thus leaving the cork molding blanket in its original form. This heating of the cork molding blanket also makes thesame less brittle andlhence the life thereof is materiallyincreased;

process, less damage is done to thetypeaiid hence the lite thereof is materially increased. 7 1 lhe results obtained by the use oi? our 1111- proved process givesa uniform castingplane to a matr x, \TlllCll in turn gives a uniform stereotypeplate made from theinatrix. i

In the accompanying drawings, which illustrate. the invention, like characters indicate like parts throughout the several views.

Referring to the drawings s, Fig. 1 is a view principally iiilongitudiiial central section showing a, matrix roller molding machine onwhich the improved apparatusis mounted; x

Fig. 2 is a view, on an enlarged scale, in

section showing certain parts illustrated. in

F l and illustrating the formation of a matrix;

l-Tig. 3 is a View of the improved apparatus struction, and of the parts thereof illustrated, it is important to note the frame 5, travelling bed 6, pressure roller 7,s1'n0othing. rollers 8, hearing brackets 9, in which said rollers are journaled, cover plate 10, and pressure lever 11.

Referring now in detail to the improved appaatus, the numeral 12 indicates a hollow heating table, thetop of which affords a supporting surface on which the molding blankets are heated. The top memb'erof this table 12 is made 'displaceable to afford access to the interior of said table. This table ,12 is supported on a. metallic humidifying cabinet 13, which in turn is supported over the molding machineon supplemental end brackets 14:, formingextensions oi' the bearing brackets 9. This cabinet 18 is for the storage of moistened matrix-forming dry fiongs It may be here stated that these flongs a; when received from the producer, are dry and before they can be used in making a matrix, moisture must be induced therein in order that said fiongs, when squeezed onto type forms, will enter the depressions therein.

.ifIo keep the flongs a: in the same moist condition in which they are placed in the cabinet 13, said cabinet is provided above said flongs with a shelf 15, in the form of a screen, on which is removablymounted a moisture-containing pad 16 offelt or other suitable absorbent material. Any suitable means may beused forkeeping the pad 16 supplied with moisture. y

The cabinet 13 is provided with a door opening normally closed by a gravity-closed door 17, and through which opening the {longs w and pad 16 may be placed in the cabinet 13 orremoved therefrom. The entire internal surface of the table 12, with the exception of its top member or blanketsupporting surface, is covered with an insu lating material 18.

Within the hollow table 12 is a plurality of edgewise spaced electrical heating elements 19 which rest 011 longitudinally extended mounting strips 20 laid on the bottom insulation 18. Said hollowtable 12 is filled with sand 21 or other heat-conducting material for the purpose of evenly distributing the heat over the top member of the 1 table 12.

An electric circuit 22 for the heating ele ments 19, as diagrammatically illustrated in i Fig. 3, has interposed therein a switch 23 for making and breaking said circuit. This switch 23 is automatically controlled for keeping the top of the table 12 at a predetermined tempe'ature by a thermostat 24 which may be of any suitable form and, diag'ammatically shown, comprises a heatconducting tube 24, one end portion of which extends into the table 12 and is embedded in the sand 21, and the other end portion thereofis shaped to form a spiral coil 26 having an arm 27 to which the switch 23 is-rigidly securedand insulated therefrom. Supported on the travelling bed- 3 a type form 28 comprising a chase 29., a chase wedge 30, and type 31. 1

As previously stated, thecork molding blanket and one or more, shown, molding blankets ofwool i'elt are usedin connection with one of the conditioned {longs w for makingja matrix, and which blankets are indicated in Fig 2 by thcnumerals 32 and 33, respectively. In carrying out the improved process, the cork molding blanket isjlaid on the topof the table 12 and covered with the molding blankets 33, and kept heated to a predetermined temperature controlled by thethermostat. y

To make a matrix from the type form 29, one otthe flongs m is removed from the cabiwool felt molding blankets 33 while covering the cork molding blanket 32 on the heating table 12 hold the heat in said cork blanket and when in the molding machine insulate said cork blanket from the roller 7 and keep the same from get-ting cold.

What we claim is: y

l. The process of forming a matrix from a dry flong which consists in subjecting the flong to moisture and applying the same while moist to a form, in heating a molding blanket andapplying the same to the back of the fiong, and insubjecting the llong and blanket to pressure on the form while said blanket is hot.

2. The processdefined in claiml in which the molding blanket isheated to a predeterminedtemperature, and using the same WllllB at substantially the same temperature.

3. The process of forminga matrix from a dry flong which consists in subiiecting the flong to moisture and applying the same while moist to atorm in heating a flexible molding blanket and applying the same to the back o'f the hang, and in subjecting the net 13 and laid on said form and then the hot cork molding blanket 32 and the wool the flong and the latter to the back of the 1 flexible molding blanketyand subjecting the fiong and blankets to pressure While said blankets are hot.

In testimony whereof we allix our signatures.

CHARLES J. V. HENTSCHELL. GEORGE H. VVHELDON. 

